Ronstan Series 55 Ball Bearing Orbit Block™ - swivel shackle head
Kilogram for kilogram of working load, BB Orbit Blocks™ are the world’s lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimises the mass of the inactive return race and hub. The orbital ball-bearing arrangement gives the largest possible bearing race diameter. This maximises load performance. The proven Ronstan 2-stage bearing system features high compression grade acetal ball bearings and a secondary full-contact bearing. This gives minimum friction across the full working load range. The floating sheave and bearing system is supported by a fibre-reinforced load frame. The design was computer modelled to be stress optimised. The single and becket block has a through-sheave becket arrangement. The result? The lowest weight possible.
Specifications
| Bearing type | Ball bearing |
| Recommended line - Max Ø (mm) | 10 |
| Recommended Boat size - Max (ft) | 30 |
| Sheave Ø (mm) | 55 |
| Ratchet | No |
| SWL (kg) | 500 |
| NBL (kg) | 1000 |
| Weight (g) | 88 |
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